[RTPproxy Users] Re-Invites

[Maxim Sobolev]

Ronald Voermans wrote:
> Dear list,
> 
> Our company is using RTP Proxy in combination with OpenSer 1.3. We are using RTPProxy in bridge mode. I have the following issue:
> 
> A faxcall comes in via OpenSer, and is correctly proxied to the client. RTPProxy also works correctly. Next, the PSTN Gateway sends a Re-INVITE to check if the client supports T.38 (with SDP). The client responds with '488 Not Acceptable here', so the PSTN Gateway sends another (RE)-INVITE with alaw as the preferred codec. However, with this second re-invite a *new* RTPProxy-session is made. Is this because there was a 488 reply instead of a 200 OK (with SDP) reply?
> 
> For some reason (which I don't know at the moment) the client responds with an OK which is then forwarded to the PSTN Gateway, which is then again ACKed. However, the PSTN Gateway keeps sending its RTP to the initial port, instead of the port for the *new* RTPProxy-session.
> 
> Ultimately this ends up in disconnecting the call.
> 
> Does anybody know what could be the cause of this, and (more important) how to solve this?

Ronald,

It would help a lot to debug an issue if you can include SIP packet 
capture into your problem report.

Thanks!

Regards,
-- 
Maksym Sobolyev
Sippy Software, Inc.
Internet Telephony (VoIP) Experts
T/F: +1-646-651-1110
Web: http://www.sippysoft.com